Union Pacific Railroad

NPDES permit CO0048986 · Minor NON-POTW · administratively continued, expires 2021-09-30 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

This permit expired on 2021-09-30 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

EPA's record, 2025-09-01 to 2026-08-31

0values over a limit
8required values missing, on 4 form(s)
10of 69 forms filed late

Last period with anything received: 2026-07-31.

Reporting

Reports are due about 28 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (113)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeMX WK AV report only all year
001Temperature, water deg. centigradeDAILY MX report only all year
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspended30DA AVG report only all year
001Solids, total suspended30DA AVG <= 30 mg/L all year
001Solids, total suspendedMX 7D AV report only all year
001Solids, total suspendedMX 7D AV <= 45 mg/L all year
001Cyanide, weak acid, dissociableDAILY MX report only all year
001Cyanide, weak acid, dissociableROLL AVG report only all year
001Arsenic, total recoverable30DA AVG report only all year
001Iron, total recoverable30DA AVG report only all year
001Iron, total recoverable30DA AVG <= 9500 ug/L all year
001Iron, dissolved [as Fe]30DA AVG report only all year
001Iron, dissolved [as Fe]30DA AVG <= 6500 ug/L all year
001Aluminum, total recoverable30DA AVG report only all year
001Aluminum, total recoverableDAILY MX report only all year
001Aluminum, total recoverableROLL AVG report only all year
001Molybdenum, total recoverable30DA AVG report only all year
001Zinc, potentially dissolved30DA AVG report only all year
001Zinc, potentially dissolvedDAILY MX report only all year
001Silver, potentially dissolved30DA AVG report only all year
001Silver, potentially dissolved30DA AVG <= .16 ug/L all year
001Silver, potentially dissolvedDAILY MX report only all year
001Silver, potentially dissolvedDAILY MX report only all year
001Silver, potentially dissolvedROLL AVG report only all year
001Silver, potentially dissolvedROLL AVG <= .024 ug/L all year
001Copper, potentially dissolved30DA AVG report only all year
001Copper, potentially dissolvedDAILY MX report only all year
001Copper, potentially dissolvedROLL AVG report only all year
001Lead, potentially dissolvd30DA AVG report only all year
001Lead, potentially dissolvd30DA AVG <= 14 ug/L all year
001Lead, potentially dissolvdDAILY MX report only all year
001Lead, potentially dissolvdDAILY MX report only all year
001Oil and greaseINST MAX <= 10 mg/L all year
001Uranium, total30DA AVG report only all year
001Uranium, total30DA AVG <= 533 ug/L all year
001Flow, in conduit or thru treatment plant30DA AVG <= .128 MGD all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Mercury, total [as Hg]30DA AVG report only all year
001Mercury, total [as Hg]30DA AVG <= .35 ug/L all year
001Oil and grease visualINST MAX report only all year
001LC50 Static Renewal 48Hr Acute Ceriodaphnia dubiaMN VALUE >= 100 % all year
001LC50 Static Renewal 96Hr Acute Pimephales promelasMN VALUE >= 100 % all year
002pHMINIMUM >= 6.5 SU all year
002pHMAXIMUM <= 9 SU all year
002Solids, total suspended30DA AVG report only all year
002Solids, total suspended30DA AVG <= 30 mg/L all year
002Solids, total suspendedMX 7D AV report only all year
002Solids, total suspendedMX 7D AV <= 45 mg/L all year
002Arsenic, total recoverable30DA AVG report only all year
002Iron, total recoverable30DA AVG report only all year
002Aluminum, total recoverable30DA AVG report only all year
002Aluminum, total recoverableDAILY MX report only all year
002Aluminum, total recoverableROLL AVG report only all year
002Molybdenum, total recoverable30DA AVG report only all year
002Silver, potentially dissolved30DA AVG report only all year
002Silver, potentially dissolved30DA AVG <= .34 ug/L all year
002Silver, potentially dissolvedDAILY MX report only all year
002Silver, potentially dissolvedROLL AVG report only all year
002Silver, potentially dissolvedROLL AVG <= .051 ug/L all year
002Lead, potentially dissolvd30DA AVG report only all year
002Lead, potentially dissolvd30DA AVG <= 30 ug/L all year
002Lead, potentially dissolvdDAILY MX report only all year
002Lead, potentially dissolvdDAILY MX report only all year
002Oil and greaseINST MAX <= 10 mg/L all year
002Uranium, total30DA AVG report only all year
002Uranium, total30DA AVG <= 580 ug/L all year
002Flow, in conduit or thru treatment plant30DA AVG <= .06 MGD all year
002Flow, in conduit or thru treatment plantDAILY MX report only all year
002Mercury, total [as Hg]30DA AVG report only all year
002Mercury, total [as Hg]30DA AVG <= .73 ug/L all year
002Oil and grease visualINST MAX report only all year
003Temperature, water deg. centigradeMX WK AV report only all year
003Temperature, water deg. centigradeDAILY MX report only all year
003pHMINIMUM >= 6.5 SU all year
003pHMAXIMUM <= 9 SU all year
003Solids, total suspended30DA AVG report only all year
003Solids, total suspended30DA AVG report only all year
003Solids, total suspended30DA AVG <= 30 mg/L all year
003Solids, total suspendedMX 7D AV report only all year
003Solids, total suspendedMX 7D AV <= 45 mg/L all year
003Solids, total suspendedMX 7D AV <= 45 mg/L all year
003Cyanide, weak acid, dissociableDAILY MX report only all year
003Cyanide, weak acid, dissociableROLL AVG report only all year
003Arsenic, total recoverable30DA AVG report only all year
003Iron, total recoverable30DA AVG <= 9500 ug/L all year
003Iron, dissolved [as Fe]30DA AVG <= 6500 ug/L all year
003Aluminum, total recoverable30DA AVG report only all year
003Aluminum, total recoverableDAILY MX report only all year
003Aluminum, total recoverableROLL AVG report only all year
003Molybdenum, total recoverable30DA AVG report only all year
003Zinc, potentially dissolved30DA AVG report only all year
003Zinc, potentially dissolvedDAILY MX report only all year
003Silver, potentially dissolved30DA AVG <= .16 ug/L all year
003Silver, potentially dissolvedDAILY MX report only all year
003Silver, potentially dissolvedROLL AVG <= .024 ug/L all year
003Copper, potentially dissolved30DA AVG report only all year
003Copper, potentially dissolvedDAILY MX report only all year
003Copper, potentially dissolvedROLL AVG report only all year
003Lead, potentially dissolvd30DA AVG <= 14 ug/L all year
003Lead, potentially dissolvdDAILY MX report only all year
003Oil and greaseINST MAX <= 10 mg/L all year
003Uranium, total30DA AVG <= 533 ug/L all year
003Flow, in conduit or thru treatment plant30DA AVG <= .128 MGD all year
003Flow, in conduit or thru treatment plantDAILY MX report only all year
003Mercury, total [as Hg]30DA AVG <= .35 ug/L all year
003Oil and grease visualINST MAX report only all year
003LC50 Static Renewal 48Hr Acute Ceriodaphnia dubiaMN VALUE >= 100 % all year
003LC50 Static Renewal 96Hr Acute Pimephales promelasMN VALUE >= 100 % all year
004Flow, in conduit or thru treatment plant30DA AVG <= .128 MGD all year
UST1Temperature, water deg. centigradeMX WK AV report only all year
UST1Temperature, water deg. centigradeDAILY MX report only all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states